Which of the following incorrectly compares algae and cyanobacteria?

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Cyanobacteria are prokaryotes, whereas algae are eukaryotes.
Cyanobacteria are anoxygenic phototrophs, whereas algae are oxygenic.
Most cCyanobacteria are motile, while most algae are non-motile.
Algae and cyanobacteria co-exist in many environments.